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• PAGE _ <br />TABLE 39 (CONTINUED) <br />SUMMARV OF WATER QUALITY DATA <br />WATER YEAR 1992 <br />SUMMARV OF WATER QUALITY DATA, USGS SITE 009243700, MIDDLE CREEK <br />PARAMETER MEAN STD. DEV. MAX. ~ MIN. UNITS. N0. PERIOD <br />MINOR <br />FLUORIDE c0.200 0.027 0.300 <0.100 MG/L 27 10/83- 7/87 <br />PRIMARY <br />CADMIUM TOTAL <2 .111 0. 927 4. 000 c1 .000 UG/L 9 3/76- 4/61 <br />CADMIUM TOTAL RECD <0 .447 0. 431 1. 000 <0 .100 UG/L 23 10/B6- 9/92 <br />M ERCURV TOTAL <0 .340 0. 206 0. 500 <0 .100 UG/L 10 10/75- 8/79 <br />MERCURV TOTAL RECD c0 .169 0. 261 1. 500 <0 .100 UG/L 33 9/75- 9/92 <br />SELENIUM TOTAL <1 .000 0. 000 1. 000 <1 .000 UG/L 8 10/66- 7/86 <br />SELENIUM TOTAL RECD <1 .133 0. 516 3. 000 <1. 000 UG/L 16 4/89- 9/92 <br />SILVER TOTAL RECO <0 .662 0. 372 <1. 000 <0. 100 UG/L 23 10/86- 9/92 <br />SE[ONDARV <br />COPPER TOTAL RECO <69 .833 146. 459 500. 000 1 .000 UG/L 18 9/75-10/87 <br />ZINC TOTAL <19 .000 28. 183 110. 000 <3 .000 UG/L 16 9/75- 7/81 <br />ZINC ~ TOTAL RECD <21 .363 18. 072 70. 000 <10 .000 UG/L 22 4/87- 9/92 <br />IRON DISSOLVED <64 .476 88. 240 620. 000 <t0 .000 UG/L 65 9/75- 9/06 <br />IRON TOTAL RECD 3967 .330 6911. 864 52000. 000 1 .000 UG/L 71 9/75- 9/92 <br />MANGANESE DISSOLVED <117. 931 113. 009 700. 000 <10 .000 UG/L 50 10/75- 4/90 <br />MANGANESE TOTAL RECO 267. 037 326. 544 2400. 000 10 .000 UG/L B1 9/75- 9/92 <br />TRACE METALS <br />BORON DISSOLVED 42. 000 12. 292 60. 000 20. OOD UG/L 10 12/85- 7/07 <br />t BORON TOTAL 37. 500 12. 909 60. 000 20. 000 UG/L i6 10/B3- 9/06 <br />MOLYBDENUM TOTAL RECO <31. 913 23. 360 c60. 000 c1. 000 UG/L 23 10/86- 9/92 <br />' U = MICRO <br /> <br />'tlR;='4~114:ti° ~.:.~ .' ~ ..?;" ~ =_y~ .°yoaS~9~b ~r_a.~ry"` a~~_ _: ` ,C~ .. ~c.._-. ~~.'M~ r _ 1 <br />